To ease the transition to the new system, which was first agreed in 2013, nobody has so far been taken off existing electoral registers, but anyone who has not individually registered by 1 December will be removed.

Yesterday, Mr Corbyn warned that 80,000 people in Leeds risked falling off the Electoral Register when the changes come into force.

Labour says most of the people affected will be younger, or living in more deprived or urban areas, meaning these groups will be under-represented when constituency boundaries are re-drawn.

Mr Corbyn said yesterday: "They lose out and we lose out on their participation in the democratic process."

He added: "This is not boring, arcane stuff, it is the very lifeblood of democracy."

Earlier in the day, the Labour leader visited workers at Tata Steel in Scunthorpe.